Collective excitations in liquid and glassy 3-methylpentane

Handle URI:
http://hdl.handle.net/10754/579136
Title:
Collective excitations in liquid and glassy 3-methylpentane
Authors:
Benassi, Paola; Nardone, Michele; Giugni, Andrea; Baldi, Giacomo; Fontana, Aldo
Abstract:
We present a detailed investigation of the terahertz vibrational dynamics of 3-methylpentane performed by means of high-resolution inelastic x-ray scattering (IXS). We probe the dynamics in a large temperature range, which includes the glass, the supercooled liquid, and the liquid phases. The characteristic frequency of the excitations follows a well-defined dispersion curve extending beyond 8nm−1 at all the investigated temperatures, indicating the persistence of a solidlike behavior also in the liquid phase. This implies the existence of a pseudo-Brillouin zone whose size compares surprisingly well with the periodicity inferred from the first sharp diffraction peak in the static structure factor. We show that, in the investigated temperature range, both sizes undergo a variation of about 15%–20%, comparable to that of the average intermolecular distance. We finally show that the IXS sound velocity coincides with the infinite frequency sound velocity previously inferred from visible and ultraviolet Brillouin spectroscopy data. This analysis confirms the role of the shear relaxation processes in determining the variation with frequency of the apparent sound velocity.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Physical Sciences and Engineering (PSE) Division
Citation:
Collective excitations in liquid and glassy 3-methylpentane 2015, 92 (10) Physical Review B
Publisher:
American Physical Society (APS)
Journal:
Physical Review B
Issue Date:
28-Sep-2015
DOI:
10.1103/PhysRevB.92.104203
Type:
Article
ISSN:
1098-0121; 1550-235X
Additional Links:
http://link.aps.org/doi/10.1103/PhysRevB.92.104203
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorBenassi, Paolaen
dc.contributor.authorNardone, Micheleen
dc.contributor.authorGiugni, Andreaen
dc.contributor.authorBaldi, Giacomoen
dc.contributor.authorFontana, Aldoen
dc.date.accessioned2015-10-04T12:20:00Zen
dc.date.available2015-10-04T12:20:00Zen
dc.date.issued2015-09-28en
dc.identifier.citationCollective excitations in liquid and glassy 3-methylpentane 2015, 92 (10) Physical Review Ben
dc.identifier.issn1098-0121en
dc.identifier.issn1550-235Xen
dc.identifier.doi10.1103/PhysRevB.92.104203en
dc.identifier.urihttp://hdl.handle.net/10754/579136en
dc.description.abstractWe present a detailed investigation of the terahertz vibrational dynamics of 3-methylpentane performed by means of high-resolution inelastic x-ray scattering (IXS). We probe the dynamics in a large temperature range, which includes the glass, the supercooled liquid, and the liquid phases. The characteristic frequency of the excitations follows a well-defined dispersion curve extending beyond 8nm−1 at all the investigated temperatures, indicating the persistence of a solidlike behavior also in the liquid phase. This implies the existence of a pseudo-Brillouin zone whose size compares surprisingly well with the periodicity inferred from the first sharp diffraction peak in the static structure factor. We show that, in the investigated temperature range, both sizes undergo a variation of about 15%–20%, comparable to that of the average intermolecular distance. We finally show that the IXS sound velocity coincides with the infinite frequency sound velocity previously inferred from visible and ultraviolet Brillouin spectroscopy data. This analysis confirms the role of the shear relaxation processes in determining the variation with frequency of the apparent sound velocity.en
dc.language.isoenen
dc.publisherAmerican Physical Society (APS)en
dc.relation.urlhttp://link.aps.org/doi/10.1103/PhysRevB.92.104203en
dc.rightsArchived with thanks to Physical Review Ben
dc.titleCollective excitations in liquid and glassy 3-methylpentaneen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalPhysical Review Ben
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, 67100 L'Aquila, Italyen
dc.contributor.institutionIMEM-CNR, Parco Area delle Scienze 37/A, 43124 Parma, Italyen
dc.contributor.institutionDipartimento di Fisica, Università di Trento, 38050 Povo (Trento), Italyen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorGiugni, Andreaen
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